This work presents a novel systematic approach for the construction of domain ontologies. The suggested approach uses a semi-automatic construction methodology. For this study, parent-child concept pairs are taken from a previous work. Novel contributions include building and completing branches, introducing new relations, and resolving inconsistencies and contradictions. For the process systems engineering (PSE) domain the ISA88 Standard is chosen as a promising starting point for automatic text processing. Finally, this work concludes with a discussion of the ISA88 Standard based on the conclusions that can be obtained from the application of this semi-automatic construction methodology.